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INTANGIBLE ASSETS (Tables)
 6 Months Ended
Jun. 30, 2019
Intangible Assets [Abstract]  
Disclosure of reconciliation of changes in intangible assets
(US$ MILLIONS)
 
June 30, 2019
 
December 31, 2018
Gross Carrying Amount:
 
 
 
 
Beginning Balance
 
$
6,001

 
$
3,360

Additions, net
 
101

 
153

Disposals
 
(32
)
 
(8
)
Acquisitions through business combinations (1)
 
6,545

 
2,911

Assets reclassified as held for sale (2)
 
(436
)
 
—

Net foreign currency exchange differences
 
75

 
(415
)
Ending Balance
 
$
12,254

 
$
6,001

Accumulated Amortization and Impairment
 
 
 
 
Beginning Balance
 
$
(478
)
 
$
(266
)
Amortization expense
 
(224
)
 
(249
)
Disposals
 
23

 
4

Assets reclassified as held for sale
 
84

 
—

Net foreign currency exchange differences
 
4

 
33

Ending Balance
 
$
(591
)
 
$
(478
)
Net Book Value
 
$
11,663

 
$
5,523

____________________________________
(1) 
See Note 3 for additional information.
(2) 
See Note 8 for additional information.
(US$ MILLIONS)
 
June 30, 2019
 
December 31, 2018
Balance at beginning of period
 
$
2,411

 
$
1,554

Acquisitions through business combinations (1)
 
3,152

 
957

Impairment losses
 
(261
)
 
—

Dispositions
 
(21
)
 
—

Assets reclassified as held for sale
 
(212
)
 
—

Foreign currency translation
 
46

 
(100
)
Balance at end of period
 
$
5,115

 
$
2,411

____________________________________
(1) 
See Note 3 for additional information.